[sdiy] Roland DCOs

[Eric Brombaugh]

Dave Manley wrote:
> There was also the unresolved issue about what exactly the "oscillator 
> slop" parameter does.  Regarding the code, you could always get a hold 
> of one and plug into that RJ-45 debug port ;-)

(Regarding DSI P08)

Good question. If I had to guess, I'd bet that 'oscillator slop' adds a 
small amount of pseudo-random noise to the frequency control to detune 
it slightly. If I recall, there's a patch parameter that controls the 
magnitude of slop - probably the gain and/or bandwidth of the PRN signal.

Plugging into the RJ-45 debug port might work, but I would be surprised 
if they haven't set the security bits to prevent downloading the object 
code. I know some folks at Microchip (I'm about 10 miles from HQ) and 
they take that stuff seriously - once the security bit is set you have 
to decap & DPA the die to grab the flash contents. Although I'm sure any 
grade-school kid in China can do that, it gets expensive for the rest of 
us. :)

Eric